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PDF HT6P12 Data sheet ( Hoja de datos )
| Número de pieza | HT6P12 | |
| Descripción | Learning Car Alarm Decoder | |
| Fabricantes | Holtek Semiconductor | |
| Logotipo |  |
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HT6P12
Learning Car Alarm Decoder
Features
• Operating voltage: 2.4V~5.2V
• Low power consumption and high noise
immunity
• Built-in oscillator needs only 5% resistor
• Learning function
• Maximum of 8 sets of customer codes can
be stored
Applications
• Burglar alarm system
• Smoke and fire alarm system
• Garage door controllers
• Car door controllers
General Description
The HT6P12 is a 24-bit decoder with a learning
function. It pairs with the HT6P20D encoder for
remote control system applications.
The HT6P12 can interface with HOLTEK’s
EEPROM (HT93LC46). When the data pins of
the HT6P20D (data negative polarity output
type) encoder is triggered from a range of 2^24
series, a complete remote car alarm system is
formed with the HT6P12. The decoder can store
8 sets of customer codes maximum at the learn-
ing mode. The first 20 bits of the received 24 bit
of information are interpreted as a customer
Pin Assignment
• 2^24 information
• 3 local alarm trigger inputs: TRIG, AL+, AL-
• ACC can disarm whole car alarm system
• Easy interface with RF or IR medium
• Check received codes 3 times
• Car alarm system
• Security system
• Cordless telephones
• Other remote control systems
code and the last 4 bits as control signal data. If
the received 20 bits of customer code match the
bits of one of the stored customer codes in the
EEPROM after continuous checking three
times, the remaining 4-bit data are latched and
then the control function is executed.
The HT6P12 incorporates five types of output
functions, namely arm/disarm, panic, find car,
mute, and On/Off. It, in addition, provides a
momentary data output for other user-defined
special purposes.
1 2nd Oct ’97
1 page  
HT6P12
Pin Name
I/O
Internal
Connection
Description
OPT1(SK)
Input: Selection of the siren and chirp sound function:
I/O
CMOS I/O
Pull-High
Hi or Open: Chirp and siren sounds enabled
Low: Chirp and siren sounds disabled
Output: Serial clock output for EEPROM
(connected to the SK pin of EEPROM)
TRIG
I CMOS IN Alarm trigger input pin in the arm state, high active
AL–
I CMOS IN Alarm trigger input pin in the arm state, low active
AL+
I CMOS IN Alarm trigger input pin in the arm state, high active
FLASH
O CMOS OUT Flash output pin to control an external car lamp circuit
RES
I CMOS IN Input pin for resetting the chip inside, low active
VDD
— — Positive power supply
OSC
I — Oscillator input pin
DIN
I CMOS IN Serial data input pin
LEARN(LED) I/O
CMOS I/O
Pull-High
Input: To set the chip into the learning state or to erase all
EEPROM data when used with the CLEAR(CS) pin,
low active
Output: To sink the LED current for indicating the function
state
OPT2(DO)
Input: Selection of the car lamp flash function during alarm
Hi or Open: Lamp flash enabled
I/O
CMOS I/O
Pull-High
Low: Lamp flash disabled
Output: To activate the LED for indicating the function state
(refer to the function description)
This pin is also used to output the received data to
the EEPROM (connected to the DI pin of EEPROM)
ACC(DI)
An active high signal to the ACC pin can disarm the alarm
I CMOS IN system. This pin is also used to input data from the
EEPROM (connected to the DO pin of EEPROM)
Approximate internal connection circuits
5 2nd Oct ’97
5 Page 
HT6P12
(when the AUTO_ARM delay time is not
zero), the disarm state will change to the arm
state after the AUTO_ARM delay time (de-
fined by the “AUTO_ARM delay time” in the
option table). The timing of the alarm trigger
is shown below.
Panic mode
Whether in the arm or disarm state, after a
panic control signal has been received, the siren
will sound and the car lamp will flash. The
timing of the SIREN, FLASH, and LED outputs
is the same as the timing of the alarm trigger
mode. The active output length is on a par with
the TRIG siren active time, One interval (de-
fined by the “TRIG and Panic siren active time”
in the option taable). The siren sound as well as
the car lamp flash can be interrupted by occur-
rence of a second panic control signal or by
activating the ACC (DI) pin. The panic mode
takes a priority of other modes.
Alarm Triggers (AL+, AL-, TRIG) for Arm State
Note: During the Entry delay time, the chip ignores all trigger signals from the TRIG, AL+, AL- pins.
11 2nd Oct ’97
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet HT6P12.PDF ] | |
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